Washine machine waste water pouring out of pipe

bris

The hole will be acting as a durgle. The blockage could be further on in the system.

get one of those long wire snakes ans poke about a bit.

Lorian

Could be - If it was me I'd turn the pipe on the right upwards and pour some water in and make sure it drains freely.

FluffityBunny

you need the drainage hoses raised up so the water flows down, at the moment they are flowing up to the hole

Bendy_House

XEO25 said:

Bendy_House said:

And the W/M waste water will most likely also be going down the D/W pipe...

Will this be resolved with having the t connection higher up + the waste hoses coming in from above rather than below?

I doubt it. The main issues still remain - that standpipe is not tall enough, and the U-bend is quite large, tho'  (this bit is not a problem in itself, but it exacerbates the short-standpipe issue.)

You have the double-whatsit of a large volume of standing water in that U bend which needs to be set in motion, coupled with a short 'head' of water in that standpipe to do the 'pushing'.

That standpipe is effectively only around 250-300mm tall? Ie, from the water level to the top of the pipe.

How tall should a standpipe be? A Google suggests around 800-900mm, and anything from 450 to 750-ish above the U bend level.

The top of your pipe is - what? - 450-ish off the ground?

If so, that is almost certainly the problem. And regardless of whether there's a blockage or anything farther along the waste pipe (and there is nothing to suggest there is), that standpipe needs sorting.

Easiest job in the world - a straight connector and a short length of pipe. ~£7 all in at Screwfix.

XEO25

Update...

I've raised the existing stand pipe as high as possible and the water is still gushing out of the top.

I also bought the new stand pipe from screwfix but it seems too tall for the space.

I'm at a loss as to what I can do.

Section62

XEO25 said:

Update...

I've raised the existing stand pipe as high as possible and the water is still gushing out of the top.

I also bought the new stand pipe from screwfix but it seems too tall for the space.

I'm at a loss as to what I can do.

Given how high up the wall the water appears to be splashing, I think it is more likely a problem with the flow rate from one or other of the appliances, and the 'splashy' nature of the discharge from a pressure pipe into a larger diameter pipe.  I'm with plumb1_2 that the design of that fitting is poor - having two entries directly opposite each other, at 90 degrees to the line of flow, coupled with an open hole immediately adjacent, is simply asking for trouble. It goes against basic good drainage practice not to have the entry angled so the flow is directed into the main outlet pipe in the direction of flow.

There's a possibility the discharge pipe has a partial blockage or obstruction, but even if so I would get rid of that fitting and use something more appropriate to the job.

Ideally in this case use a separate standpipe/trap for each appliance. (assuming this isn't next to a sink)

plumb1_2

Call me old fashioned but I would always install 2 standpipes in this set up.
Extra 10 minutes work to install a extra one,throw that adapter in the bin, fit a tee to the outlet pipe and fit 2 standpipes.
I would suspect a kitchen fitter has installed that piece of crap.
Someone mentioned do I know McApine make waste fitting etc, I must have fitted over 200 TP10v traps in the last few years( plumbing spec) not my choice. And regular replace them as the air vent seal fails.
Best McAlpine fittings are their compression couplings and elbows.

Take  that adapter off and fit one of the hose,s in the standpipe  and run the machine to determine there isn’t a blockage in the waste going through the wall. Then you’ll know what the issue is.

Bendy_House

XEO25 said:

Update...

I've raised the existing stand pipe as high as possible and the water is still gushing out of the top.

I also bought the new stand pipe from screwfix but it seems too tall for the space.

I'm at a loss as to what I can do.

Ah. Ok, that's my theory pretty well debunked.

The new pipe would obviously need cutting to size to make it fit, but I have to agree that the seeming force of water being ejected seems to indicate that's there's a significant draining issue farther along beyond the U-bend.

I'm not at all familiar with that fancy double-entry connection at the top, but assumed that whoever designed it - McAlpine or whoevs - knew what they were doing, and the inlets would have been directed downwards into the pipe? I mean, the pumped flow cannot surely be aimed at the air hole?!

Assuming that the flow is aimed downwards, then I cannot see this issue being caused by that top fitting; you are only pumping one appliance down that pipe, and it isn't coping. 

I guess the next obvious step would be to remove the complete U-bend from where it enters the wall, and to check for blockages.

Can you tell where that pipe goes once it's through the wall?

Another check would be to try that existing setup but without that twin-fitting. Ie, remove the fitting, fit the new standing pipe (cut to size) until it's, say, 3-4" from the worktop, and shove the W/M hose directly down into that, so's it's a good ~foot down in there, and if that still back-flows out the pipe, there is an issue with the waste pipe further along beyond the U-bend.

NSG666

Section62 said:

XEO25 said:

Update...

I've raised the existing stand pipe as high as possible and the water is still gushing out of the top.

I also bought the new stand pipe from screwfix but it seems too tall for the space.

I'm at a loss as to what I can do.

Given how high up the wall the water appears to be splashing, I think it is more likely a problem with the flow rate from one or other of the appliances, and the 'splashy' nature of the discharge from a pressure pipe into a larger diameter pipe.  I'm with plumb1_2 that the design of that fitting is poor - having two entries directly opposite each other, at 90 degrees to the line of flow, coupled with an open hole immediately adjacent, is simply asking for trouble. It goes against basic good drainage practice not to have the entry angled so the flow is directed into the main outlet pipe in the direction of flow.

There's a possibility the discharge pipe has a partial blockage or obstruction, but even if so I would get rid of that fitting and use something more appropriate to the job.

Ideally in this case use a separate standpipe/trap for each appliance. (assuming this isn't next to a sink)

In fairness, if you look at the technical drawing for the fitting the two inlets have a barrier between them and the air break has a tube around the inside of it so water from the appliances is being forced down and away from the hole. It's a good shout from plumb1 to take the fitting off and try it with the washing machine hose pipe being pushed down the tube though.

plumb1_2

Most probably sweetcorn and carrots blocking the waste 😊